Turns out that model railroaders have no-one to blame but themselves. Especially those modelling Appalachia and the Deep South. Spreading the stuff for years with abandon on veritable oceans of dilute white glue have led directly to the current crisis. Sustainability? Sidelined. Future generations? Forgotten. Nobody cared. As long as there was enough ground foam to cover this hillside or that open patch of plaster, it was let's-make-scenery-while-the-sun-shines.
AS IF THIS WEREN'T ENOUGH - Nobody listens anymore. I said...Light, RAPID and Comfortable. Pay attention, people.